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Lambs Luc, Mangion Perrine, Mougin Eric, Fromard François |
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Water cycle and salinity dynamics in the mangrove forests of Europa and Juan de Nova Islands, southwest Indian Ocean |
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2016 |
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Rapid Communications in Mass Spectrometry |
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30 |
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2 |
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311-320 |
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Rationale The functioning of mangrove forests found on small coralline islands is characterized by limited freshwater inputs. Here, we present data on the water cycling of such systems located on Europa and Juan de Nova Islands, Mozambique Channel. Methods In order to better understand the water cycle and mangrove growth conditions, we have analysed the hydrological and salinity dynamics of the systems by gauge pressure and isotopic tracing (δ18O and δ2H values). Results Both islands have important seawater intrusion as measured by the water level change and the high salinities in the karstic ponds. Europa Island displays higher salinity stress, with its inner lagoon, but presents a pluri?specific mangrove species formation ranging from shrub to forest stands. No freshwater signal could be detected around the mangrove trees. On Juan de Nova Island, the presence of sand and detrital sediment allows the storage of some amount of rainfall to form a brackish groundwater. The mangrove surface area is very limited with only small mono?specific stands being present in karstic depression. Conclusions On the drier Europa Island, the salinity of all the water points is equal to or higher than that of the seawater, and on Juan de Nova the groundwater salinity is lower (5 to 20 PSU). This preliminary study shows that the karstic pothole mangroves exist due to the sea connection through the fractured coral and the high tidal dynamics. Copyright ? 2015 John Wiley & Sons, Ltd. |
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0951-4198 |
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0951-4198 |
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6849 |
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Thomas Frederikse, Maya K. Buchanan, Erwin Lambert, Robert E. Kopp, Michael Oppenheimer, D. J. Rasmussen, Roderik S. W. van de Wal |
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Title |
Antarctic Ice Sheet and emission scenario controls on 21st-century extreme sea-level changes |
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2020 |
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Nature Communications |
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11 |
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1 |
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390 |
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Uncertainties in Representative Concentration Pathway (RCP) scenarios and Antarctic Ice Sheet (AIS) melt propagate into uncertainties in projected mean sea-level (MSL) changes and extreme sea-level (ESL) events. Here we quantify the impact of RCP scenarios and AIS contributions on 21st-century ESL changes at tide-gauge sites across the globe using extreme-value statistics. We find that even under RCP2.6, almost half of the sites could be exposed annually to a present-day 100-year ESL event by 2050. Most tropical sites face large increases in ESL events earlier and for scenarios with smaller MSL changes than extratropical sites. Strong emission reductions lower the probability of large ESL changes but due to AIS uncertainties, cannot fully eliminate the probability that large increases in frequencies of ESL events will occur. Under RCP8.5 and rapid AIS mass loss, many tropical sites, including low-lying islands face a MSL rise by 2100 that exceeds the present-day 100-year event level. |
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2041-1723 |
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6437 |
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Angélique Melet, Benoit Meyssignac, Rafael Almar, Gonéri Le Cozannet |
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Title |
Under-estimated wave contribution to coastal sea-level rise |
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2018 |
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Nature Climate Change |
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8 |
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3 |
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234–239 |
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Coastal communities are threatened by sea-level changes operating at various spatial scales; global to regional variations are associated with glacier and ice sheet loss and ocean thermal expansion, while smaller coastal-scale variations are also related to atmospheric surges, tides and waves. Here, using 23 years (1993–2015) of global coastal sea-level observations, we examine the contribution of these latter processes to long-term sea-level rise, which, to date, have been relatively less explored. It is found that wave contributions can strongly dampen or enhance the effects of thermal expansion and land ice loss on coastal water-level changes at interannual-to-multidecadal timescales. Along the US West Coast, for example, negative wave-induced trends dominate, leading to negative net water-level trends. Accurate estimates of past, present and future coastal sea-level rise therefore need to consider low-frequency contributions of wave set-up and swash. |
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Bachelor's thesis |
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1758-6798 |
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1758-6798 |
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7045 |
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Testut L., B. Legrésy, C. Watson, R. Coleman, H. Brolsma, R. Handsworth. |
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Title |
Sea level trends in the Commonwealth Bay over the last century from historical data |
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Communication |
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2018 |
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Workshop on sea-level measurements in hostile conditions, 13-15 march 2018, moscow. |
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7046 |
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Testut L., P. Téchiné, M. Calzas, A. Guillot, C. Guillerm, C. Brachet, C. Drezen, L. Fichen, T. Donal. |
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The French tide gauges network in Southern Ocean and Antarctica – ROSAME – Conclusions and recommendations after 25 years of experience |
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Communication |
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2018 |
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Workshop on sea-level measurements in hostile conditions, 13-15 march 2018, moscow. |
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7047 |
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Author |
Guillot A. and A. Santamaria. |
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Mission Nivmer 18, mars-avril 2018 |
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2018 |
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7048 |
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Testut L., P. Téchiné. |
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Proposition de campagne à la mer – IFREMER-IPEV-IRD. Fiche “Valorisation des résultats des campagnes océanographiques en série”, 26 pages, 27 mars 2018 |
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2018 |
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7049 |
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Guillot A. & T Donal |
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Mission Nivmer 19-ddu, janvier 2019 |
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2019 |
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7050 |
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Author |
S. Jevrejeva, A. Matthews, A. Slangen |
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Title |
The Twentieth-Century Sea Level Budget: Recent Progress and Challenges |
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2017 |
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Surveys in Geophysics |
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38 |
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1 |
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295-307 |
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Data archeology Observing system Sea level budget Sea level rise |
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For coastal areas, given the large and growing concentration of population and economic activity, as well as the importance of coastal ecosystems, sea level rise is one of the most damaging aspects of the warming climate. Huge progress in quantifying the cause of sea level rise and closure of sea level budget for the period since the 1990s has been made mainly due to the development of the global observing system for sea level components and total sea levels. We suggest that a large spread (1.2 ± 0.2–1.9 ± 0.3 mm year−1) in estimates of sea level rise during the twentieth century from several reconstructions demonstrates the need for and importance of the rescue of historical observations from tide gauges, with a focus on the beginning of the twentieth century. Understanding the physical mechanisms contributing to sea level rise and controlling the variability of sea level over the past few 100 years are a challenging task. In this study, we provide an overview of the progress in understanding the cause of sea level rise during the twentieth century and highlight the main challenges facing the interdisciplinary sea level community in understanding the complex nature of sea level changes. |
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1573-0956 |
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1573-0956 |
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7051 |
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Author |
Téchiné P., B. Buisson, L. Testut, G. Alory, T. Delcroix. |
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ROSAME/SSS – Suivi de la qualité des mesures de réseaux d'observations océanographiques |
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2017 |
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Jdev 2017 : journées développement logiciel, 4-7 juillet 2017, marseille. |
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7052 |
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